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WORK PLAN • <br /> FOR GROUND WATER WELL INSTALLATION AND MONITORING <br /> PORT OF STOCKTON-ROUGH AND READY ISLAND,CALIFORNIA <br /> A licensed surveyor will vertically locate the newly installed monitor wells relative to <br /> mean sea level (msl), to within 0.01 feet, and laterally within the NAD 23 coordinate <br /> system. The elevation of the adjacent ground surface will be surveyed to within 0.1 feet <br /> msl. <br /> 3.2.6 Ground water sampling <br /> After the wells are constructed, grab samples of ground water will be collected <br /> following the methodology presented in Section 4.1. Theses samples will be analyzed <br /> using the methodology presented in Section 4.2. <br /> 4. QUARTERLY GROUNDWATER MONITORING <br /> Ground water monitoring will be performed quarterly in the monitor wells at MO-1 for <br /> one year after installation. The following describe the procedures to be performed. <br /> 4.1 GROUNDWATER SAMPLING <br /> At each well, depth to water and total well depth will be measured to the nearest 0.01 <br /> foot with an electronic water-level indicator. Following depth-to-water measurements, <br /> the monitor well will be purged of at least three casing volumes or until pH and <br /> electrical conductivity have stabilized to within 10 percent. Ground water will be <br /> purged using disposable bailers or a pump. Temperature, pH, electrical conductivity, <br /> and dissolved oxygen (DO) in the purged water will be monitored and recorded in the <br /> field during the well purging process. <br /> Samples will be collected after the water level has recovered to within 80 percent of the <br /> original volume in the well. If the well is purged dry, additional purging will not be <br /> performed and samples will be collected after the water level has recovered to within 80 <br /> percent of the original volume in the well. Purge water will be placed on the ground. <br /> Ground water samples will be collected into laboratory prepared bottles using a <br /> disposable bailer or a low-flow pump. The bottles will be promptly sealed, labeled, and <br /> placed in a chest containing ice pending transportation to the analytical laboratory <br /> under standard chain-of custody protocols. <br /> 4.2 GROUNDWATER SAMPLE ANALYSIS <br /> All ground water samples will be analyzed for the following constituents: <br /> September 2014 11 Environmental Risk Services a rC <br /> Corporation JJ <br />